THE INFLUENCE OF A D.C. CROSSED MAGNETIC FIELD ON THE ELECTRICAL DISCHARGE CHARACTERISTICS OF GASES IN THE TOWNSEND REGION.
Final scientific rept. 1 Sep 64-30 Sep 67,
LEEDS UNIV (ENGLAND) DEPT OF ELECTRICAL AND ELECTRONIC ENGINEERING
Pagination or Media Count:
The influence of a crossed magnetic field on a gaseous Townsend discharge in nitrogen, hydrogen, argon and ethane for uniform field gap distances between 0.3 and 1.2 cm at pressures from 0.5 to 700 Torr using a magnetic field up to 7500 gauss, can be adequately accounted for by the equivalent pressure concept. On this basis formulae for the sparking voltage in a crossed magnetic field are derived which agree well with the experimental results. A new method for determining the important electron-molecule collision frequency from sparking voltage data is described the values so derived for N2 and H2 agree with those reported in the literature and those for Ar and C2H6 are new. Pre-breakdown ionization current measurements were made in Ar and N2 for Hp up to 2000 GTorr and for 30 or Ep or 1000 VcmTorr. The measured values of the primary ionization coefficient in N2 agree well with the calculated ones for 200 or Ep or 500. Finally a probe method is described to study the lateral movement of a Townsend discharge this should make it possible to determine the discharge propagation velocity at a later stage. Author
- Electricity and Magnetism
- Plasma Physics and Magnetohydrodynamics